<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
            <div class="button-wrapper">
              <div class="button">{{this.currentCity}}</div>
            </div>
          </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
          <div class="button-list">
            <div class="button-wrapper" 
            v-for="item of hot" 
            :key="item.id"
            @click="handleCityClick(item.name)"
            >
              <div class="button">{{item.name}}</div>
            </div>
          </div>
      </div>
      <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom" 
          v-for="innerItem of item" 
          :key="innerItem.id"
          @click="handleCityClick(innerItem.name)"
          >
            {{innerItem.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import {mapState, mapMutations} from 'vuex'
export default {
  name:'CityList',
  props:{
    cities:Object,
    hot:Array,
    letter:String
  },
  computed:{
    ...mapState({
      currentCity:'city'
    }
    )
  },
  methods:{
    handleCityClick (city) {
      //这行代码和下面那行代码意思一样this.$store.commit('changeCity',city)
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style lang='stylus' scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color :#ccc
    &:after
      border-color :#ccc
  .border-topbottom
    &:before
      border-color :#ccc
  .list
    overflow :hidden
    position :absolute
    top:1.58rem
    left :0
    right :0
    bottom :0
    .title
      line-height :.54rem
      background :#eee
      padding-left :.2rem
      color :#666
      font-size :.26rem
    .button-list
      overflow :hidden
      padding :.1rem .6rem .1rem .1rem
      .button-wrapper
        float :left
        width :33.33%
        .button
          margin :.1rem
          padding :.1rem 0
          text-align :center
          border :.02rem solid #ccc
          border-radius :.06rem
    .item-list
      .item
        line-height :.76rem
        padding-left :.2rem

</style>


